There is a myth going around that blood is blue until it comes in contact with oxygen. The truth is, when your skin and veins come into contact, the light reflecting off of your skin makes your veins appear to be blue, when they are actually red.
PS: people who claim that blood is blue, due to lack of oxygen, have only heard it from other people, and have not bothered to research their "educated" answer. It's not true, it has been scientifically proven
1 year ago
Last edited at 8:14AM on 3/31/2012
Blood is actually a red liquid whose colour appears to change depending on the oxygenation levels at any given point. Blood that is exposed to open air becomes very oxygenated, turning it the vibrant red colour.
In humans and other hemoglobin-using creatures, oxygenated blood is bright red. This is due to oxygenated iron in the red blood cells. Deoxygenated blood is a darker shade of red, which can be seen during blood donation and when venous blood samples are taken. However, due to an optical effect caused by the way in which light penetrates through the skin, veins typically appear blue in color. This has led to a common misconception that venous blood is blue before it is exposed to air. Another reason for this misconception is that medical charts always show venous blood as blue in order to distinguish it from arterial blood which is depicted as red on the same chart.
Hello, Nuclear. Oxygenated blood, in the arteries, is a bright cheerful red, but the blood returning to the heart has much less oxygen, and is a darker red, which can look purplish, depending on the light. If you have to give a blood sample, you'll see your de-oxygenated blood, which will give you a better idea. If you want to know about so-called "Blue Blood" in aristocrats, you can look this up on the web.
People, we have oxygen inside of our bodies! What do you think we are breathing in? Blood is always red. When it leaves the heart and moves out to the limbs through the arteries, it is bright red. When it returns to the heart through the veins, it is a darker red because it doesn't have as much oxygen.
When you have blood drawn from the crook of your elbow, it is taken from a vein and is a darker shade of red. If you ever had blood drawn from an artery, it would be taken from deep inside your wrist and it would be bright red.
Blood does not change colors when it "hits oxygen". The body is full of oxygen because we fill our lungs with it every time we breathe in. BLOOD IS NEVER BLUE!!
1 year ago
Last edited at 7:26PM on 4/11/2012
No. Blood rich in oxygen and poor in carbon dioxide is bright red, blood rich in carbon dioxide and poor in oxygen (deoxygenated, meaning LESS oxygen not no oxygen) is a darker red. The reason that so many people think that some blood in your body is blue (myself included at one point) is because in diagrams of capillaries and veins (rich in carbon dioxide) deoxygenated blood is REPRESENTED as blue, it isn't really blue (these posters appear a lot in schools). The liquid part of your blood (plasma) is a very light yellow (if you separate it from red blood cells) the red blood cells (needless to say) are red, giving the blood its red color. (And don't argue with me about the plasma; it's in our text book!)
Blood is blue. How do I know this? Well, I'm an alien haha
Just kidding; kid.
Blood is red. The only reason of why it appears blue, is because.. when you put a bright light over your wrist or arm, where your veins, are... some of your veins will appear blue. We do have blue and red veins, but this does not mean we have blue blood. When you cut open one of your veins, there will be red blood, but... don't even think about cutting one of your veins; since I said that. You need those ;) Obviously